CN218759699U - Down-the-hole hammer - Google Patents

Abstract

The application discloses a down-the-hole impactor, which comprises an outer cylinder; the joint is connected with the rear end of the outer cylinder, and a high-pressure air passage is arranged in the joint; the gas distribution seat assembly is fixedly sleeved in the outer cylinder and is provided with a check valve for opening and closing the high-pressure air passage; the buffer cushion is arranged in the outer cylinder and sleeved on the outer side of the gas distribution seat assembly, the rear end face of the buffer cushion is abutted to the joint, and the front end face of the buffer cushion is abutted to the limiting face; the buffer cushion comprises a buffer cushion and is characterized in that a first avoidance groove is formed in the outer wall of the buffer cushion, and a second avoidance groove is formed in the inner wall of the buffer cushion. The application provides a down-the-hole impacter compares in prior art, becomes the rigid connection between joint and the distribution seat flexible connection, and the normal use of impacter is guaranteed to the difficult drunkenness that takes place of component in the outer cylinder.

Description

Down-the-hole hammer

Technical Field

The application relates to the technical field of rock drilling tools, in particular to a down-the-hole hammer.

Background

With the development of industry, various infrastructure projects are continuously promoted. The down-the-hole hammer is widely used as a drilling device in blasting projects in engineering construction of mines, hydropower stations, ports, roads, tunnels and the like, and is used for excavating blasting drill holes and the like. The pneumatic down-the-hole hammer uses high-pressure air as a power source to drive a piston in the hammer to reciprocate at high speed and high frequency, so that the piston obtains enough energy to impact a drill bit to drill. The impact force acts on the drill bit in the form of stress waves, huge impact energy is generated within a very short time, rocks can be effectively crushed, holes can be formed quickly, and the purpose of drilling the rocks and the holes is achieved.

In the down-the-hole hammer in the prior art, high-pressure gas enters a high-pressure channel in a joint, the high-pressure gas flows to a piston through a gas distribution seat after rushing open a check valve, so that pressure difference is generated at two ends of the piston, the piston continuously moves up and down, and when the piston impacts a drill bit downwards, the drill bit breaks rocks due to violent impact. Because the joint is rigidly connected with the air distribution seat, the piston has indirect impact effect on the air distribution seat in the process of moving up and down, and the impact force can make the air distribution seat play, thereby influencing the normal use of the impactor.

Therefore, a down-the-hole impactor is needed, wherein rigid connection between a joint and an air distribution seat is changed into flexible connection, components in an outer cylinder are not easy to move, and normal use of the impactor is guaranteed.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the application provides a down-the-hole impacter, becomes the rigid connection between joint and the valve actuating seat flexible connection, and the difficult drunkenness that takes place of part in the outer cylinder guarantees the normal use of impacter.

The technical scheme provided by the application is as follows:

a down-the-hole impactor comprising:

an outer cylinder;

the joint is connected with the rear end of the outer cylinder, and a high-pressure air passage is arranged in the joint;

the gas distribution seat assembly is fixedly sleeved in the outer cylinder and is provided with a check valve for opening and closing the high-pressure air passage;

the buffer cushion is arranged in the outer cylinder and sleeved on the outer side of the gas distribution seat assembly, the rear end face of the buffer cushion is abutted to the joint, and the front end face of the buffer cushion is abutted to the limiting face;

wherein the content of the first and second substances,

the outer wall of the buffer cushion is provided with a first avoidance groove, and the inner wall of the buffer cushion is provided with a second avoidance groove.

Preferably, the groove width of the first avoidance groove increases toward a direction approaching the outer cylinder, and the groove width of the second avoidance groove increases toward a direction departing from the outer cylinder.

Preferably, a closed ring groove is formed among the joint, the outer cylinder and the air distribution seat assembly, and the buffer pad is arranged in the ring groove.

Preferably, the valve train assembly includes:

the cushion pad is sleeved on the outer side of the gas distribution seat, the limiting surface is arranged on the gas distribution seat, and the limiting surface is abutted against the inner cylinder;

the gas distribution channel is arranged in the gas distribution seat and is communicated with the high-pressure gas channel;

the gas distribution seat is arranged at the rear end of the gas distribution seat and used for installing the installation hole of the check valve.

Preferably, the valve train assembly comprises:

the gas distribution seat is fixedly sleeved in the outer cylinder, and a gas distribution channel matched with the piston for use is arranged in the center of the gas distribution seat;

the valve seat is arranged at the rear end of the gas distribution seat and detachably connected with the gas distribution seat, and a gas channel used for connecting the high-pressure gas channel and the gas distribution channel is arranged on the valve seat;

the check valve is movably arranged at the rear end of the valve seat and used for opening and closing the high-pressure air passage.

Preferably, the method further comprises the following steps:

and a clamping ring which is abutted against the air distribution seat is arranged on the inner wall of the outer cylinder.

Preferably, the first and second electrodes are formed of a metal,

the buffer pad suit is in the outside of disk seat, be equipped with spacing step on the disk seat, be provided with in the joint with spacing groove that spacing step cooperation was used.

Preferably, the front end of the gas distribution seat is provided with a positioning groove matched with the valve seat for use, and the positioning groove is communicated with the gas distribution channel.

Preferably, the check valve includes:

the valve rod is connected with the gas distribution seat assembly in a sliding mode, and a conical connector matched with the high-pressure gas channel is arranged on the valve rod;

the positioning hole is arranged at one end, far away from the conical joint, of the valve rod;

and the elastic resetting piece is sleeved in the positioning hole.

Preferably, the air outlet of the high-pressure air passage is provided with an inclined surface matched with the outer surface of the conical joint.

The utility model provides a down-the-hole impacter, at first because be provided with the outer jar, connect, distribution seat subassembly, check valve and blotter, wherein, connect the rear end with the outer jar and link to each other, be provided with high-pressure air flue in connecting, high-pressure air flue and outside high pressurized air source intercommunication, be provided with distribution seat subassembly in the outer jar, the check valve sets up on distribution seat subassembly, a high pressurized air source is used for opening and closing, the blotter sets up in the outer jar, and the blotter suit is in the outside of distribution seat subassembly, the rear end face and the joint butt of blotter, the preceding terminal surface and the spacing butt of blotter, spacing setting is on distribution seat subassembly, through being provided with the blotter, rigid connection between distribution seat subassembly and the joint converts flexonics into. In the installation process, the buffer pad is arranged between the joint and the gas distribution seat assembly and has certain pre-pressure, and in the reciprocating movement process of the piston, the buffer pad is always abutted against the rear end face of the gas distribution seat assembly, so that the rear end face of the gas distribution seat assembly is better limited. Secondly, when the blotter receives the extrusion, certain deformation can appear in the blotter and carry out the shock attenuation, in order to guarantee the life-span of extension blotter when the shock attenuation effect of blotter, the embodiment of the utility model provides a down-the-hole impacter still includes that first dodge groove and second dodge the groove, wherein, first dodge the one side that the groove setting is close to the inner wall of outer jar at the blotter, and the second dodges the one side that the groove setting kept away from the outer jar at the blotter, dodges the groove through setting up first dodge groove and second, when the blotter receives the extrusion, provides the space for the deformation of blotter, and the better and life-span of blotter of buffering effect is longer. Therefore, compare with prior art, the embodiment of the utility model provides a down-the-hole impacter becomes the rigid connection between joint and the distribution seat flexible connection, and the difficult drunkenness that takes place of part in the outer cylinder guarantees the normal use of impacter.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view (with an inner casing) of a down-the-hole impactor according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of a cushion pad provided in an embodiment of the present invention;

FIG. 3 is another schematic structural view (without an inner casing) of the down-the-hole impactor according to the embodiment of the invention;

fig. 4 is a schematic structural view of a gas distribution base provided in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a check valve according to an embodiment of the present invention.

Reference numerals: 1. an outer cylinder; 2. a joint; 4. a check valve; 5. a cushion pad; 6. an inner cylinder; 7. a piston; 8. a snap ring; 21. a high pressure air passage; 22. a limiting groove; 31. a gas distribution base; 32. a gas distribution channel; 33. mounting holes; 34. a valve seat; 35. a gas channel; 36. a limiting step; 37 positioning grooves; 41. a valve stem; 42. a tapered joint; 43. positioning holes; 44. an elastic reset member; 51. a first avoidance slot; 52. a second avoidance slot.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, are not essential to the technology, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.

The embodiment of the utility model provides an adopt progressive mode to write.

As shown in fig. 1 to 5, an embodiment of the present invention provides a down-the-hole hammer, including: an outer cylinder 1; the joint 2 is connected with the rear end of the outer cylinder 1, and a high-pressure air passage 21 is arranged in the joint 2; the air distribution seat assembly is fixedly sleeved in the outer cylinder 1, and a check valve 4 for opening and closing the high-pressure air passage 21 is arranged on the air distribution seat assembly; the buffer cushion 5 is arranged in the outer cylinder 1 and sleeved on the outer side of the gas distribution seat assembly, the rear end face of the buffer cushion 5 is abutted with the joint 2, and the front end face of the buffer cushion 5 is abutted with the limiting face; wherein, the outer wall of the buffer pad 5 close to the outer cylinder 1 is provided with a first avoidance groove 51, and the inner wall of the buffer pad 5 close to the gas distribution seat assembly is provided with a second avoidance groove 52.

It should be noted that, in the embodiment of the present invention, "the rear end of the outer cylinder" refers to the end of the outer cylinder close to the joint, and "the front end of the outer cylinder" in the embodiment of the present invention refers to the end of the outer cylinder close to the drill bit.

In the down-the-hole impacter in the prior art, because the joint is rigidly connected with the air distribution seat, the piston has indirect impact effect on the air distribution seat in the process of moving up and down, and the impact force can make the air distribution seat generate play so as to influence the normal use of the impacter.

The utility model provides a down-the-hole impacter, at first because be provided with outer jar 1, connect 2, distribution seat subassembly, check valve 4 and blotter 5, wherein, connect 2 and outer jar 1's rear end and link to each other, be provided with high-pressure air flue 21 in connecting 2, high-pressure air flue 21 and outside high pressurized air source intercommunication, be provided with distribution seat subassembly in the outer jar 1, check valve 4 sets up on distribution seat subassembly, be used for opening and closing high pressurized air source, blotter 5 sets up in outer jar 1, and blotter 55 suit is in the outside of distribution seat subassembly, the rear end face and the 2 butts that connect of blotter 5, the preceding terminal surface and the spacing face butt of blotter 5, spacing face sets up on distribution seat subassembly, through being provided with blotter 5, convert distribution seat subassembly and the rigid connection between the joint 2 into flexonics. In the installation process, the buffer cushion 5 is arranged between the connector 2 and the gas distribution seat assembly, the buffer cushion 5 has certain pre-pressure, and in the reciprocating movement process of the piston, the buffer cushion 5 is always abutted against the rear end face of the gas distribution seat assembly, so that the rear end face of the gas distribution seat assembly is better limited. Secondly, when blotter 5 receives the extrusion, certain deformation can appear in blotter 5 and carry out the shock attenuation, in order to prolong the life-span of blotter 5 when guaranteeing blotter 5's shock attenuation effect, the embodiment of the utility model provides a down-the-hole impacter still includes first groove 51 and the second of dodging and dodges groove 52, wherein, first groove 51 of dodging sets up in one side that blotter 5 is close to the inner wall of urceolus 1, the second dodges groove 52 and sets up the one side of keeping away from urceolus 1 at blotter 5, dodge groove 51 and second through setting up first groove 52 of dodging and second, when blotter 5 receives the extrusion, provide the space for blotter 5's deformation, the better and blotter 5 life-span of buffering effect is longer. Therefore, compare with prior art, the embodiment of the utility model provides a down-the-hole impacter will connect and become the flexonics with the rigid connection between the distribution seat subassembly, and the difficult drunkenness that takes place of part in the outer cylinder 1 guarantees the normal use of impacter.

In the structure, the embodiment of the utility model provides an in the effect of first groove 51 and the second of dodging dodge groove 52 mainly be for blotter 5 provides deformation space when receiving the extrusion, because the space between joint 2 and the gas distribution seat subassembly is less, blotter 5 is when receiving the impact of both ends along the axis direction, can produce deformation along radial direction, if there is not the space to take place deformation, can influence the damping performance of blotter 5, therefore, dodge groove 52 and provide deformation space for blotter 5 through setting up first groove 51 and the second of dodging, guarantee the damping performance of blotter 5, prolong blotter 5's life, piston reciprocating motion's in-process, blotter 5 all the time with the rear end face butt of gas distribution seat subassembly, the better rear end face to the gas distribution seat subassembly carries on spacingly.

In the above structure, the shape of the first groove 51 and the second groove 52 includes but not only is limited to the arc groove and the polygonal groove, and as one of them embodiment, the embodiment of the present invention provides that the groove width of the first groove 51 increases toward one side close to the outer steel, and the groove width of the second groove 52 increases toward one side far away from the outer cylinder 1, so that the damping effect is better when the processing is facilitated.

More specifically, the first avoidance groove 51 and the second avoidance groove 52 in the embodiment of the present invention are V-shaped grooves.

Furthermore, the cushion pad 5 in the embodiment of the present invention is made of a rubber material.

In above-mentioned structure, blotter 5 carries out the shock attenuation through the deformation of self, because high temperature, high-pressure environment in the outer jar 1 cause the inefficacy and the breakage of blotter 5 very easily, if there is the clearance between joint 2 and the gas distribution seat subassembly, broken 5 fragments of blotter enter into the piston along with high-pressure air easily, influence the use of impacter. As one of them embodiment, the embodiment of the present invention provides a closed ring groove formed between the joint 2, the outer cylinder 1 and the gas distribution seat assembly, and the buffer pad 5 is disposed in the ring groove, so that even if the buffer pad 5 is broken in the ring groove, the use of the impactor will not be affected in the piston.

In the above structure, the type of the down-the-hole hammer provided in the embodiment of the present invention includes, but is not limited to, a down-the-hole hammer with an inner casing and a down-the-hole hammer without an inner casing, specifically, the gas distribution seat assembly in the embodiment of the present invention includes a gas distribution seat 31, a cushion pad 5 is sleeved outside the gas distribution seat 31, a limiting surface is disposed on the gas distribution seat 31, and one side of the limiting surface, which is far away from the cushion pad 5, is abutted against the inner casing 6; a gas distribution passage 32 provided in the gas distribution seat 31 to communicate with the high pressure gas passage 21; and a mounting hole 33 provided at the rear end of the valve seat 31 for mounting the check valve 4. The embodiment of the utility model provides an in 4 activities of check valve set up on distribution seat 31, 5 suits of blotter are on distribution seat 31, and the both sides of blotter 5 respectively with connect 2 and spacing face butt. Spacing face and valve block 31 are integrated into one piece structure, and the one end and the 6 butts of inner cylinder of the valve block 31 one end of keeping away from joint 2, inner cylinder 6 and 1 fixed connection of outer cylinder, piston activity set up in inner cylinder 6, provide the pulse effort for the drill bit. Among the prior art because connect between and the distribution seat, be rigid connection between distribution seat and the inner casing, the piston produces indirect impact at the in-process that reciprocates to distribution seat and inner casing, and this kind of impact force can make distribution seat and inner casing take place the drunkenness, and then influences the normal use of impacter, the embodiment of the utility model discloses rigid connection that will connect between and the distribution seat becomes flexible connection, and distribution seat and the difficult drunkenness that takes place of inner casing in the outer cylinder 1 guarantee the normal use of impacter.

As another embodiment, the utility model also provides a down-the-hole impacter of no inner casing, because be provided with the inner casing not, the diameter of piston is bigger, more is difficult to the fracture, and impacter life is longer. Specifically, the valve train subassembly includes: a gas distribution seat 31 fixedly sleeved in the outer cylinder 1, wherein a gas distribution channel 32 matched with the piston 7 is arranged at the center of the gas distribution seat 31; a valve seat 34 arranged at the rear end of the gas distribution seat 31 and detachably connected with the gas distribution seat 31, wherein a gas channel 35 used for connecting the high-pressure gas passage 21 and the gas distribution channel 32 is arranged on the valve seat 34; the check valve 4 is movably disposed at a rear end of the valve seat 34 to open and close the high pressure gas passage 21. The gas distribution channel 32 of the down-the-hole impactor without the inner cylinder is arranged in the centre of the gas distribution block 31 and the gas distribution block assembly therefore comprises a gas distribution block 31 and a valve seat 34 detachably connected to the gas distribution block 31. The check valve 4 and the gas channel 35 for communicating the gas distribution channel 32 with the high-pressure gas channel 21 are arranged on the valve seat 34, and therefore the manufacturing process of the gas distribution seat assembly is simpler.

Still specifically, the utility model discloses a mounting hole 33 sets up the rear end at the disk seat, and check valve 34 movable mounting is in mounting hole 33.

Further, the utility model discloses in carry on spacingly through blotter 5 and joint 2 to the rear end face of distribution seat 31, for the convenience carry on spacingly to the preceding terminal surface of distribution seat 31, the embodiment of the utility model provides an in the hole hammer still includes snap ring 8, wherein, snap ring 8 sets up on outer cylinder 1's inner wall, and snap ring 8 and distribution seat 31's preceding terminal surface butt, saves space more.

More specifically, the embodiment of the utility model provides an in be provided with the installation annular on the inner wall of outer jar 1, snap ring 8 specifically be with the opening annular structure that the cooperation of installation annular was used, the dismouting of the snap ring 8 of being convenient for, the equipment of impacter is more convenient.

Furthermore, the utility model discloses the blotter 5 suit in the embodiment is equipped with spacing step 36 in the outside of disk seat 34 on the disk seat 34, is provided with the spacing groove 22 that uses with spacing step 36 cooperation in the joint 2. More specifically, when the impactor is assembled, the cushion 5 is mounted on the outer side of the valve seat 34, the rear end of the cushion 5 abuts against the limiting step 36, the valve seat 34 is mounted on the gas distribution seat 31, the limiting step 36 is positioned through the limiting groove 22, the front end surface of the joint 2 abuts against the cushion 5, and the rear end surface of the gas distribution seat 31 abuts against the cushion 5.

Further, the embodiment of the utility model provides an in the front end of distribution seat 31 is provided with constant head tank 37, and constant head tank 37 uses with the cooperation of disk seat 34, and the disk seat 34 of being convenient for is installed on distribution seat 31, and wherein, constant head tank 37 and distribution channel 32 intercommunication when disk seat 34 is installed on distribution seat 31, through gas passage 35 intercommunication high-pressure air flue 21 and distribution channel 32 to make the piston at outer jar reciprocating motion, provide the pulse effort for the drill bit and break the rock.

In the above structure, the check valve 4 in the embodiment of the present invention includes a valve rod 41 slidably connected to the air distribution seat assembly, and a taper joint 42 used in cooperation with the high-pressure air passage 21 is disposed on the valve rod 41; a positioning hole 43 provided at an end of the valve stem 41 remote from the taper joint 42; and the elastic resetting piece 44 is sleeved in the positioning hole 43. Through set up locating hole 43 on valve rod 41, prevent that elasticity reset piece 44 from producing the skew when taking place elastic deformation, elasticity reset piece 44 suit is in locating hole 43, when not letting in compressed gas in the high-pressure gas channel 21 of joint 2, the elastic force of elasticity reset piece 44 acts on valve rod 41, so that tapered joint 42 closes high-pressure gas channel 21, when letting in compressed gas in the high-pressure gas channel 21 of joint 2, under compressed gas's effort, push tapered joint 42 open, so that communicate through gas passage 35 between high-pressure gas channel 21 and the distribution channel 32, under compressed gas's effect, piston 7 moves along the axis direction of outer cylinder 1, provide the pulse effort for the drill bit.

Furthermore, the gas outlet of the high pressure gas passage 21 in the embodiment of the present invention is provided with an inclined plane, wherein the inclined plane is used in cooperation with the outer surface of the conical joint 42, so that the sealing effect of the conical joint 42 is better.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A down-the-hole impactor, comprising:

an outer cylinder (1);

the joint (2) is connected with the rear end of the outer cylinder (1), and a high-pressure air passage (21) is arranged in the joint (2);

the air distribution seat assembly is fixedly sleeved in the outer cylinder (1), and a check valve (4) used for opening and closing the high-pressure air passage (21) is arranged on the air distribution seat assembly;

the buffer cushion (5) is arranged in the outer cylinder (1) and sleeved on the outer side of the gas distribution seat assembly, the rear end face of the buffer cushion (5) is abutted against the joint (2), and the front end face of the buffer cushion (5) is abutted against the limiting face;

wherein the content of the first and second substances,

the outer wall of the buffer cushion (5) is provided with a first avoidance groove (51), and the inner wall of the buffer cushion (5) is provided with a second avoidance groove (52).

2. A down-the-hole impactor according to claim 1,

the groove width of the first avoidance groove (51) is increased towards the direction close to the outer cylinder (1), and the groove width of the second avoidance groove (52) is increased towards the direction away from the outer cylinder (1).

3. A down-the-hole impactor according to claim 2,

the joint (2), the outer cylinder (1) and form the confined annular between the gas distribution seat subassembly, blotter (5) set up in the annular.

4. A down-the-hole impactor according to claim 3,

the valve train assembly comprises:

the buffer pad (5) is sleeved on the outer side of the gas distribution seat (31), the limiting surface is arranged on the gas distribution seat (31), and the limiting surface is abutted against the inner cylinder (6);

a gas distribution channel (32) arranged in the gas distribution seat (31) and communicated with the high-pressure gas passage (21);

the mounting hole (33) is arranged at the rear end of the gas distribution seat (31) and used for mounting the check valve (4).

5. A down-the-hole impactor according to claim 3,

the valve train assembly comprises:

the gas distribution device comprises a gas distribution seat (31) fixedly sleeved in the outer cylinder (1), wherein a gas distribution channel (32) matched with a piston (7) is arranged in the center of the gas distribution seat (31);

the valve seat (34) is arranged at the rear end of the gas distribution seat (31) and detachably connected with the gas distribution seat (31), and a gas channel (35) used for connecting the high-pressure gas channel (21) and the gas distribution channel (32) is arranged on the valve seat (34);

the check valve (4) is movably arranged at the rear end of the valve seat (34) and used for opening and closing the high-pressure air passage (21).

6. A down-the-hole impactor according to claim 5,

further comprising:

the inner wall of the outer cylinder (1) is provided with a snap ring (8) which is abutted against the air distribution seat (31).

7. A down-the-hole impactor according to claim 5,

the buffer pad (5) is sleeved on the outer side of the valve seat (34), a limiting step (36) is arranged on the valve seat (34), and a limiting groove (22) matched with the limiting step (36) is formed in the joint (2).

8. A down-the-hole impactor according to claim 7,

the front end of the air distribution seat (31) is provided with a positioning groove (37) matched with the valve seat (34) for use, and the positioning groove (37) is communicated with the air distribution channel (32).

9. A down-the-hole impactor according to any one of claims 1 to 8,

the check valve (4) comprises:

the valve rod (41) is connected with the air distribution seat assembly in a sliding mode, and a conical connector (42) matched with the high-pressure air channel (21) is arranged on the valve rod (41);

a positioning hole (43) arranged at one end of the valve rod (41) far away from the conical joint (42);

and the elastic resetting piece (44) is sleeved in the positioning hole (43).

10. A down-the-hole impactor according to claim 9,

and an air outlet of the high-pressure air passage (21) is provided with an inclined surface matched with the outer surface of the conical joint (42).

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